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S = √(∑(xi - Xrata)/ ( n)
S =√ (4-5)²+(4-5)² + (4-5)²+(5-5)²+.....+(7-5)² / n
S=√ 1 +1+1+0+0+0+0+0+0+1+4 / n
S =√8/10
S = √0,8
S = √4/5
S= 2/√5
S= 2 √5 /5
S = 2/5√5